I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 70)

Readiris TM 14 – User Guide
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Rotating images
To rotate an image, click the Rotate icon. Then click the required
option.
A
DJUSTING THE
I
MAGE
Q
UALITY
The recognition results depend a great deal on the image quality of
your documents. If you're scanning very low-quality documents,
Readiris will not be able to recognize them properly.
The reason for this is that Readiris works by converting pictures of
text characters into actual text characters. If your documents are
too dark, the characters fade into one another and create black spots.
If your documents are too light, the text characters might be broken.
Consequently, Readiris will not be able to recognize them.
Example 1: text is too dark
In the image below, the letter shapes begin to fill in and become
fuzzy. Letters like a, e, and o are almost completely blurred.